RFR: JDK-8246212: JPKG001-012: application icon is missing in Control Panel Add/Remove

[Alexey Semenyuk]

Please review fix [2] for jpackage bug [1].

Fix how icon is configured for installers on Windows. The value of 
ARPPRODUCTICON property should point to an entry in Icon table of msi 
rather to a path of icon file in install directory. The issue shows up 
only in downgrade scenarios.

- Alexey

[1] https://bugs.openjdk.java.net/browse/JDK-8246212

[2] http://cr.openjdk.java.net/~asemenyuk/8246212/webrev.00